httpd_util(3erl)

1httpd_util(3)              Erlang Module Definition              httpd_util(3)
2
3
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NAME

6       httpd_util - Miscellaneous utility functions to be used when implement‐
7       ing
8         Erlang web server API modules.
9

DESCRIPTION

11       This module provides the Erlang web server API module  programmer  with
12       miscellaneous utility functions.
13

EXPORTS

15       convert_request_date(DateString) -> ErlDate|bad_date
16
17              Types:
18
19                 DateString = string()
20                 ErlDate = calendar:datetime()
21
22              convert_request_date/1  converts  DateString  to the Erlang date
23              format. DateString must be in one  of  the  three  date  formats
24              defined in RFC 2616.
25
26       create_etag(FileInfo) -> Etag
27
28              Types:
29
30                 FileInfo = file_info()
31                 Etag = string()
32
33              create_etag/1  calculates  the Etag for a file from its size and
34              time for last modification. FileInfo is a record defined in ker‐
35              nel/include/file.hrl.
36
37       day(NthDayOfWeek) -> DayOfWeek
38
39              Types:
40
41                 NthDayOfWeek = 1-7
42                 DayOfWeek = string()
43
44              day/1  converts the day of the week (NthDayOfWeek) from an inte‐
45              ger (1-7) to an abbreviated string, that is:
46
47              1 = "Mon", 2 = "Tue", ..., 7 = "Sat".
48
49       decode_hex(HexValue) -> DecValue
50
51              Types:
52
53                 HexValue = DecValue = string()
54
55              Converts the hexadecimal value HexValue into its decimal equiva‐
56              lent (DecValue).
57
58       flatlength(NestedList) -> Size
59
60              Types:
61
62                 NestedList = list()
63                 Size = integer()
64
65              flatlength/1 computes the size of the possibly nested list Nest‐
66              edList, which can contain binaries.
67
68       hexlist_to_integer(HexString) -> Number
69
70              Types:
71
72                 Number = integer()
73                 HexString = string()
74
75              hexlist_to_integer converts the hexadecimal value  of  HexString
76              to an integer.
77
78       integer_to_hexlist(Number) -> HexString
79
80              Types:
81
82                 Number = integer()
83                 HexString = string()
84
85              integer_to_hexlist/1  returns  a string representing Number in a
86              hexadecimal form.
87
88       lookup(ETSTable,Key) -> Result
89       lookup(ETSTable,Key,Undefined) -> Result
90
91              Types:
92
93                 ETSTable = ets_table()
94                 Key = term()
95                 Result = term() | undefined | Undefined
96                 Undefined = term()
97
98              lookup extracts {Key,Value} tuples from ETSTable and returns the
99              Value  associated with Key. If ETSTable is of type bag, only the
100              first Value associated with Key is  returned.  lookup/2  returns
101              undefined and lookup/3 returns Undefined if no Value is found.
102
103       lookup_mime(ConfigDB,Suffix)
104       lookup_mime(ConfigDB,Suffix,Undefined) -> MimeType
105
106              Types:
107
108                 ConfigDB = ets_table()
109                 Suffix = string()
110                 MimeType = string() | undefined | Undefined
111                 Undefined = term()
112
113              lookup_mime  returns  the  MIME  type associated with a specific
114              file suffix as specified in the file mime.types (located in  the
115              config directory).
116
117       lookup_mime_default(ConfigDB,Suffix)
118       lookup_mime_default(ConfigDB,Suffix,Undefined) -> MimeType
119
120              Types:
121
122                 ConfigDB = ets_table()
123                 Suffix = string()
124                 MimeType = string() | undefined | Undefined
125                 Undefined = term()
126
127              lookup_mime_default returns the MIME type associated with a spe‐
128              cific file suffix as specified in the mime.types  file  (located
129              in  the   config  directory).  If  no appropriate association is
130              found, the value of DefaultType is returned.
131
132       message(StatusCode,PhraseArgs,ConfigDB) -> Message
133
134              Types:
135
136                 StatusCode = 301 | 400 | 403 | 404 | 500 | 501 | 504
137                 PhraseArgs = term()
138                 ConfigDB = ets_table
139                 Message = string()
140
141              message/3 returns an informative HTTP 1.1 status string in HTML.
142              Each StatusCode requires a specific PhraseArgs:
143
144                301:
145                  string(): A URL pointing at the new document position.
146
147                400 | 401 | 500:
148                  none (no PhraseArgs).
149
150                403 | 404:
151                  string(): A Request-URI as described in RFC 2616.
152
153                501:
154                  {Method,RequestURI,HTTPVersion}:  The  HTTP Method, Request-
155                  URI, and HTTP-Version as defined in RFC 2616.
156
157                504:
158                  string(): A string describing why the service  was  unavail‐
159                  able.
160
161       month(NthMonth) -> Month
162
163              Types:
164
165                 NthMonth = 1-12
166                 Month = string()
167
168              month/1  converts  the month NthMonth as an integer (1-12) to an
169              abbreviated string, that is:
170
171              1 = "Jan", 2 = "Feb", ..., 12 = "Dec".
172
173       multi_lookup(ETSTable,Key) -> Result
174
175              Types:
176
177                 ETSTable = ets_table()
178                 Key = term()
179                 Result = [term()]
180
181              multi_lookup extracts all {Key,Value} tuples  from  an  ETSTable
182              and returns all Values associated with Key in a list.
183
184       reason_phrase(StatusCode) -> Description
185
186              Types:
187
188                 StatusCode  =  100| 200 | 201 | 202 | 204 | 205 | 206 | 300 |
189                 301 | 302 | 303 | 304 | 400 | 401 | 402 | 403 | 404 |  405  |
190                 406 | 410 411 | 412 | 413 | 414 415 | 416 | 417 | 500 | 501 |
191                 502 | 503 | 504 | 505
192                 Description = string()
193
194              reason_phrase returns Description of an HTTP 1.1 StatusCode, for
195              example, 200 is "OK" and 201 is "Created". For more information,
196              see RFC 2616.
197
198       rfc1123_date() -> RFC1123Date
199       rfc1123_date(Date) -> RFC1123Date
200
201              Types:
202
203                  Date = calendar:datetime()
204                 RFC1123Date = string()
205
206              rfc1123_date/0 returns the current  date  in  RFC  1123  format.
207              rfc_date/1  converts  the  date  in the Erlang format to the RFC
208              1123 date format.
209
210       split(String,RegExp,N) -> SplitRes
211
212              Types:
213
214                 String = RegExp = string()
215                 SplitRes = {ok, FieldList} | {error, errordesc()}
216                 Fieldlist = [string()]
217                 N = integer
218
219              split/3 splits String in  N  chunks  using  RegExp.  split/3  is
220              equivalent  to  regexp:split/2 with the exception that N defines
221              the maximum number of fields in FieldList.
222
223       split_script_path(RequestLine) -> Splitted
224
225              Types:
226
227                 RequestLine = string()
228                 Splitted = not_a_script | {Path, PathInfo, QueryString}
229                 Path = QueryString = PathInfo = string()
230
231              split_script_path/1  is  equivalent  to  split_path/1  with  one
232              exception. If the longest possible path is not a regular, acces‐
233              sible, and executable file, then not_a_script is returned.
234
235       split_path(RequestLine) -> {Path,QueryStringOrPathInfo}
236
237              Types:
238
239                 RequestLine = Path = QueryStringOrPathInfo = string()
240
241              split_path/1 splits RequestLine in a file reference (Path),  and
242              a  QueryString  or a PathInfo string as specified in RFC 2616. A
243              QueryString is isolated from Path with a question mark  (?)  and
244              PathInfo  with a slash (/). In the case of a QueryString, every‐
245              thing before ? is a Path and everything after  ?  is  a  QueryS‐
246              tring.  In  the  case of a PathInfo, RequestLine is scanned from
247              left-to-right on the hunt for longest possible Path being a file
248              or a directory. Everything after the longest possible Path, iso‐
249              lated with a /, is regarded as PathInfo. The resulting  Path  is
250              decoded using decode_hex/1 before delivery.
251
252       strip(String) -> Stripped
253
254              Types:
255
256                 String = Stripped = string()
257
258              strip/1  removes any leading or trailing linear white space from
259              the string. Linear white space is to be read as  horizontal  tab
260              or space.
261
262       suffix(FileName) -> Suffix
263
264              Types:
265
266                 FileName = Suffix = string()
267
268              suffix/1  is  equivalent to filename:extension/1 with the excep‐
269              tion that Suffix is returned without a leading dot (.).
270

NAME

DESCRIPTION

EXPORTS

SEE ALSO